Paving machine



10 Sheets-Sheet 1 Il H 1 T l June 1G, 1941*. R. D. BAKER PAVING MACHINEyFiled Dec. 19, 1938 June 10, 1941.

R. D. BAKER PAVING MACHINE 10 Sheets-Sheet 2 Filed Dec. 19, 1938 I June10,1941't R. D. BAKER 2,245,426

PAVING MACHINE Filed Deo. 19, 1958 1o sheets-sheet s ,an zza MW r"ATTORNE Y June 10, 194. R. Q BAKER l2,245,426

PAVING MACHINE Filed Decy 19, 1938 l0 Sheets-Sheet 4 [NI/ENTOR l m n Nwww (MQ lTOR/vzw Jne l0, 1941. R. D. BAKE 2,245,426`

PAVING MACHINE Filed Dec. 19, 1938 10 Sheets-Sheet 5 NVENTOR BY d/ZH 'nA T NEY June 1 0, 1,941. R. DfBAKr-:R 2,245.426

PAVING \MACHINE Filed Dec. 15af 195s 1o sheets-sheet e June 1o, 1941. AR. b. BAKER 2,245,426

PAVING' MACHINE Filed Dec. 19, 1938 l0 SheetshShefL '7 1N VIENTO/l BY'aer Zder:

' AT RNEY June 10,1941. R. D. BAKER PAVING MACHINE ,lO Sheets-Sheet 8Filed Deo. 19, 1938 /NVENTQR I A ORNE Y SNN . mk NWN NNN N mw NN-June1o,1941. l RnB/mm y 2,245,426

PAVING MACHINE Filed Dec. 19, 1958 10 Sheets-Sheet 9 v 48 /N VENTO/e EE. Be/Z ,Edina v Elf 1 A TTORNE Y `Fune l0, 1941 R. D. BAKER PAVI'NGMACHINE l0 Sheets-Sheet 10 Filed Dec. 19, 1938 3W KN. NN

[NVENTO iwf-ri l I dllfcn W Patented June 10, 1941 UNETED STTES PATENTOFFICE PAVING Robert D. Baker, Birmingham, Mich.

Application December 19, 1938, Serial No. 246,589

14 Claims.

This invention relates to paving machines and in particular to paversadapted to lay concrete or asphalt pavements.

One object of the invention is to provide a paver adapted to spread,compact and tamp concrete or asphalt mixes to their maximum degree ofdensity whereby to provide a concrete or asphalt pavement havingsubstantially no voids therein.

Another object of the invention is to provide a paver adapted to spreadlow slump concrete mixes and compact the mixes after spreading to asufficient degree of density to assure maximum strength of the finishedroadway.

Another object of the invention is to provide a paver adapted to layconcrete or asphalt mixes to a desired line and grade Without the use ofpre-laid road forms or .other trackage.

Another object of the invention is to provide a paver adapted to spreadlow slump concrete mixes and compact the same to a density which willenable the traction members of .the machine to run on the finishedconcrete surface immediately after compaction withoutv any materialdisplacement thereof.

AAnother object of the invention is Vto provide a paver adapted tospread concrete or asphalt mixes between forms carried by the saidpaver, compact the mix to a desired grade and then tamp the saidcompacted mix to its maximum possible density whereby to admit of thetraction members of the said paving machine traveling over the completedpavement prior to the setting of the concrete or hardening of theasphalt without damag-e thereto or material displacement thereof.

Another object of the invention is to provide a paving machine adaptedto spread concrete or asphalt mixes to a depth considerably deeper thanthe finished pavement to be laid thereby, and then compact the concreteor asphalt mix by means of ycompaction members having va combinedgenerally elliptical and rocking movement in a path parallel to thedirection of travel of the said paving machine which both compacts andsmooths the material fed thereunder by the spreading mechanism to thedesired depth and to amaximum density.

Another object of the invention is to provide a p-aving machine adaptedto spread concrete 'or asphalt mixes to a depth considerably deeper thanthe iinished pavement to be laid thereby, and then compact sufficient ofthe said spread concrete or asphalt mix to assure a pavement of maximumdensity by means of compaction members having a combined generallyelliptical and rocking movement which advances surplus materialthereahead.

Another object of the invention is to provide a paver adapted to spreadconcrete or asphalt mixes to a thickness greater than the depth of thefinished pavement being laid thereby, compact the said mix afterspreading with a rapid combined compressing and smoothing action into apavement of the desired thickness, and then tamp the said compactedpavement by a rapid treadle action, all progressively as the paver movesforward over the surface to be paved thereby. v

Other objects of the invention will become apparent by reference tothefollowing detailed description taken in connection with the accompanyingdrawings, in which:

Fig. 1 is a more or less diagrammatic plan view of a paving machineembodying the in- Vention.

Fig. 2 is ran enlarged fragmentary more or less diagrammatic sectionalview taken on the line 2-2 of Fig. 1.

Fig. 3 is an enlarged side elevational view of the novel paver.

Fig. 4 is a rear elevational view of the machine. v

Fig. 5 is a fragmentary plan View of the Inachine with thecompactor-tamper mechanism omitted. t

Fig. 6 is a cross sectional view of the machine showing thecompactor-tamper assem-bly in rear elevation.

Fig. 7 is a detailed sectional View taken on th line 'I-T of Fig. 6showing the tamper quick-lift operating lever ratchet.

Fig. 8 is a detailed view in perspective showing the quick-liftsuspension of the tamper members.

Fig. 9 is an enlarged partial plan view of the compactor-tamperassembly.

Fig. 10 is a vertical sectional View taken on the line Illl0 of Fig. 9.

Fig. 11 is an enlarged fragmentary side eleva tional view of the machineshowing the side forms carried thereby and the means preferably employedfor resiliently holding the same to the vdesired adjusted position.

Fig. 12 is a vertical sectional view taken on the line |2-l2 of Fig. 11.

Fig. 13 is a detailed vertical sectional view showing thecompactor-tamper mechanism employed.

Fig. 14 is a detailed vertical sectional View taken on the line lll-ltof Fig. 5 showing the special tamper preferably employed adjacent theside forms to assure maximum density along the edge of any strip ofpavement laid by the machine.

Fig. 15 is a diagrammatic view of the means employed to drive thevarious elements of the machine.

Fig. 16 is a diagrammatic View sho-wing the preferred movement of thecompaction and tamper members.

Fig. 17 is a diagrammatic view showing the path of travel oi the base ofthe heel of a compaction member.

Fig. 18 is a diagrammatic view showing-the path of travel of the toe ofa `compaction member. K

Fig. le is a diagrammatic view showing the path ci travel of the toe ofa tamper member.

Fig. 20 is a fragmentary sectional View show- -ing how the vcompactionand tamper members iay be heated when the paving machine is used thespread, compact and tamp asphalt mixes.

Fig. .2l is a side elevational View of the novel paver equipped for usein laying asphalt mixes.

Fig. 22 is a fragmentary plan View showing the generator mounting anddrive preferably employed to heat the compaction and tamper members whenthe paver is used to lay asphalt mixes.

The embodiment of the machine disclosed in Figs. l to 19 inclusiveadapted for use in laying concrete pavement and the modification thereofshown in Figs. 20 to 22 inclusive for use in laying asphalt mixes eachcarry their own forms,

however, although not shown `and described in detail, it is contemplatedthat the novel compacter-tamper mechanism disclosed and claimed hereinmay be used in a like and similar manner in machines for laying eitherconcrete or asphalt pavement which are constructed to run on the usualpre-set forms as heretofore .common practice.

In the following detailed description of the illustrative embodiments ofthe invention shown in the drawings, like reference numerals and lettersrrefer to like and corresponding parts throughout the several views.

GENERAL DESCRIPTION A brief general description will be given rstfollowed by a more detailed description of the construction andoperation of the machines. The novel paver disclosed in Figs. 1 to 19inclusive comprises a main frame Z5 preferably supported for mobility onfront Wheels 26 and rear caterpillar type endless treads 2. The saidrmain frame 25 has a sub-frame 28 adjustably suspended therefrom whichcarries compaction members 29 and tampers Sil disposed rearwardly withrespect to a hopper 3i supported on the main frame 25 from whichconcrete or asphalt mixes are fed by gravity after agitation and lateraldistribution by suitable conveying type agitator blades 32. The saidcompaction members 29 are preferably mounted and powered to compact andsmooth mixes spread thereahead by a rapid combined elliptical androcking movement which has been found to produce an extremely densefinished pavement having substantially no voids therein. The saidcompaction members 29 are so formed as to advance surplus material fedthereto thereahead during their combined elliptical and rockingmovement, only accepting for compacting sufficient material to assuremaximum density of the pavement being laid thereby. The said tampers 3Sfollow the compaction members 2S and provide a finished tamp by a rapidtreadle action.

Side forms .33 are preparably carried by the machine along both sidesthereof and are resiliently mounted on the main frame 25 in such amanner as to float on the fine-graded terrain or seminished surface uponwhich a concrete or asphalt pavement is laid by the machine. A specialtamper ii is provided at each side of the hopper 3E disposed adjacentthe side forms 33 and located just ahead of the compaction members 2%.The said special tampers 34 compact the edges of strips of' pavementduring the laying thereof by the machine.

The sub-frame 28 is suspended from the main frameiron suitable means forraising, lowering and tilting the same with respect to the main framef5. The heels of the tampers 3i! are `mounted von quick-lift .meansparticularly to admit of being lifted at the beginningof the laying of astrip of pavement and being lowered when the rear caterpillar tractionmembers V2'! rise to the finished grade as the machine advances ontofreshly laid pavement, however, the quick-lift means may be :employed atother times during the operationV of the machine to raise and lower theheels of the tampers 3G as may be required or found desirable.

The novel paver disclosed in Figs. 20 to 22 inclusive is similar inevery respect to the paver disclosed in Figs. lto 19 inclusive with theexception that the side forms 33@ thereof are short- .ened and heatingelements Vhave been provided onthe compaction members 2E: and thetampers ".il. n generator F35 has been added to supply electric currentto 'the Vcompaction member and .tamper heatingelements. The specialtampers iid lhave also been omitted.

'The paver disclosed in Figs. 1 to 19 inclusive ispreferably used forlaying concrete mixes 4and -is readily changed over by the minordetailed changes Aalcove mentioned and as disclosed in Figs. 20 to 22inclusive to a paver adapted to lay asphalt mixes. Both embodiments ofthe invention utilize .the same novel Compactortamper mechanism whichhas been found to compact. andY tamp mixes Vspread thereahead into anAextremely .dense finished pavement `having a minimum of voids therein.

A detailed description of the construction and operation of thenovelpavers will now be given.

.Mainframe and mobile means The main frame 25 is composed of a pair oflongitudinally disposed laterally spaced Ypreferably box shaped members40 and forward, central. and rear :main cross members 4|, 42 and 43respectively spanning transversely between the said longitudinal framemembers E9. The rear of the said main frame 25 is supported onlongitudinally disposed outer bolsters #.4 depending from .therear ofthe said box shaped longitudinal members Ml and on longitudinallydisposed inner bolsters l5 secured to the bottom of `the central crossmember 42 and the rear cross member 43. Each pair of bolsteds comprisingone outer .bolster ifi and one inner bolster 4d is pivotally supportedon a caterpillar tread axle d which in turn `is mounted cn a pair ofside rails '4l of one of the caterpillar endless treads 27. Front andrear caterpillar tread sprocket shafts 43 and 49 carrying caterpillarAtread sprockets V5!! are journaled in the usual take-up type bearingsbolted or otherwise secured to the said side rails 41. Although notshown, the usual caterpillar tread idlers may bev employed to preventthe lower run of the caterpillar endless treads 21 from deflectingbetween the caterpillar tread sprockets 58. Each caterpillar endlesstread 21 has a drive sprocket 52 keyed to the rear tread sprocket shaft49 to admit of driving the same by means of a chain drive, clutch andtransmission means as hereinafter described in detail.

The front end of the side longitudinally disposed main frame members 48extends a considerable distance forward from the forward cross member Myand are each supported on a front wheel 26 preferably having a tire 53thereon. Each front wheel is rotatably mounted on an axle 54 fixedthrough the lower bifurcated end 55 of a vertically disposed spindle 53journaled through a suitable bracket 51.

said spindles 56 by such means as a conveniently located steering wheel58 mounted on a steering column 59 connected to worn and pinion gearing6|] adapted to turn a transversely disposed steering shaft 6| on theouter ends of which arcuately movable levers 62 and 53 are keyed indiametrically opposed relationship to each other; the said arcuatelymovable levers 62 and 63 impart opposed reciprocating motion to a pairof steering rods 64 linked at their rear ends to the said arcuate levers32 and 63 and at their front ends to steering arms 85 keyed to the upperends of the said spindles 55, all as best shown in Figs. l, 3, 4 and 5.

At the side of the machine nearest the steering wheel 58 a pair of shortsecondary longitudinal frame members 68 are provided to support theouter end of the compactor-tamper drive shaft B1. Another pair ofsecondary longitudinal frame members 68 located near the center of Athemachine supports the caterpillar drive transmission 69 and caterpillardrive main clutch 10. And still another pair of secondary longitudinalframe members 1| located at the side of the machine opposite thesteering wheel 58 supports the engine 12, main clutch 13 and maintransmission 14. All the said secondary longitudinal frame members 5G,88 and 1| are supported on and rigidly secured to members 4|, 42 and 43.

- An operators platform is-preferably welded to the top of the mainframe in the region of the steering wheel 5S and other operatingcontrols.

Hopper and agitator to lay.

A transversely disposed agitator shaft 80 is journaled on suitablebearings 8| secured to the sides of the hopper 3| a short distance abovethe open bottom thereof. One end of the said agitator shaft 88 isextended through one of its supporting bearings 8| and has a drivesprocket 82 keyed thereon as shown in Fig. 5. The said agitator shaft 80is rotated rather slowly by a chain Steering of the paver isaccomplished by turning of the drive running over the sprocket 82 ashereinafter described in detail. v

The said agitator shaft 88 Vhasa plurality of spaced conveying typeagitator blades 32 secured thereon radially extending therefrom. Thesaid agitator blades are pitched as shown in Fig.:5 to distributeconcrete or asphalt mixes across the entire width of the hopper 3| isindicated by the arrows 83 in Fig. 1. The said concrete or asphalt mixesare dumped'into the hopper 3| at about the transverse center thereoffrom dump trucks or the like which are preferably employed to supply theconcrete or asphalt mixes to the paver during the operation thereof.

Side forms Which pavement being laid by the paver may be compactedwithout adhering thereto. 'I'he wide lower ange 85 of each side form 33rides on the rough grade indicated by the dot and dash line 81throughout the drawings. The depth ofthe side forms 33 is preferablygreater than the maximum depth of the thickest pavement which may belaid by the paver. Also, the said side forms 33 are suciently deep toadmit of the top thereof to extend above the lower edge 3H! of thehopper 3| when the said side forms are adjusted to their lowestposition.

Each side form 33 is provided with at least two vertically disposedoffset preferably channel shaped slides 88 preferably welded theretowhich are telescopingly retained by vertically disposed keeper members89 between pairs of vertically disposed guides 98 preferably welded tothe outside of a longitudinally disposed box shaped main frame member 49as best shown in Figs. 9, 1,1 and 12. The said keepers 89 are preferablysecured to the guides 98 by means of machine screWs 9|. The fit betweenthe offset slides 88 of each side form 33 and the main frame member 48,keepers 89 and guides 90 is such as will permit the side form 33 tofollow the'rough grade 81 as the paver advances thereover during itsoperation and yet maintain the side form 33 in its desired and properalignment. Although but twor sets of offset slides 88, keepers 89 andguides 98 are shown in the drawings for each side form 33, it is obviousthat three or four sets may be used if found desirable and advantageousWhere extremely long side forms 33 are employed.

Referring now particularly to Figs. 3, 4, 5, 11 and 12, each side form33 is carried by the longitudinal box shaped main frame member 48thereabove and is constantly urged against the rough grade 81 by aspring loaded side form supporting plunger 92 telescopingly mountedthrough a sleeve 93 disposed through the said box shaped frame member 48and secured thereto by suitable machine screws 94. Each side form 33 isprovided with a xed pivot pin 95 extending outwardly therefrom which isjournaled through the depending end 96 of the said plunger 92, the saidpivotal connection between the side form 33 and its supporting plunger92 being employed to `minimize the possibility of the plunger 92 bindingin its sleeve mounting 93 due to any play that may exist or developbetween the slides 8|! vof the side form 33 and the guides Si) on themain longitudinal frame member fil between which the said slides aretelescoped.

Each side form 33 is adapted to be raised or lowered to the desiredworking position by means of an L-shaped lever 97 which is fulcrumed ona suitable pivot pin 9S extending through the upper .end of a leversupporting bracket S9 secured to the top of a main longitudinal boxshaped frame member d3 as best shown in Fig. 11. 'Ihe lever 91 1s fixedin any desired position by means of a set pin |33 which is telescopedthrough a suitable aperture in the said lever Sl and through one of thepositioning apertures IBI in an arcuately shaped stay arm |32cantilevered from the said lever supporting bracket 99. The extreme end|63 of the lever 37 is preferably bifurcated for receiving the side formsupporting plunger 32 therebetween. The said side form -plunger 32 andthe side form 33 carried thereby is preferably suspended from the top ofthe said bifurcated end |33 of the lever 97 by means of a suitable pin|36 fixed through the upper end of the said plunger 32 disposed normalto the bifurcated end |33 of the said lever Sl. The raising and loweringof the bifurcated end |33 of the said L-shaped lever 3l' raises andlowers the side form 33 suspended therefrom to the rough grade 81.

To prevent the paver from riding on its side forms 33 and losingtraction, and to compensate for any reasonable variation in the roughgrade 81, the side form supporting plungers 92 are spring loaded tocause the side forms 33 carried thereby to follow any irregularities inthe grade on which the paver is operated. Each of the said side formsupporting plungers 92 is provided with a vertically disposed slottherethrough disposed just below and normal to the bifurcated end |03 ofthe lever 91 as best shown in Figs. 11 and 12. A compression spring |06is telescoped over the said plunger 32 with annular washers |01 at eachend thereof. A lower fixed pin |38 through the said plunger 32 disposedbelow the lower annular washer Hl anchors the lower end -of the saidcompression spring |95 in a suitable location along the said plunger 32and the upper Washer 07 disposed rmly against an upper movable pin |39extending through the said vertical slot |35 in the said plunger 92resiliently maintains the said movable pin H39 against the bottom of thebifurcated end |33 of the lever 3l. The reaction of the said movable pin|39 against the bottom of the bifurcated end |63 of the lever 91constantly but yieldably urges the side forms 33 to their lowestadjusted position.

When the side forms 33 ride over high spots in the rough grade 8l onwhich pavement is being laid by the paver, the said compression springs|56 permit the said forms to yield to accommodate themselves toreasonable irregularities in the said rough grade 3i. When lowering theside forms to the rough grade Sl, it is well to compress the springs |33partially by adjusting the levers il? to a position lower than normallynecessary whereby to urge the said side forms 33 firmly yet resilientlyagainst the rough grade 3l over which a pavement is being laid toprevent any of the concrete or asphalt mix from being forced under theside forms 33 by the force of the compactor-tamper mechanism employed.

Each side form 33 is preferably provided with a pair of verticallydisposed angle brackets ||0 one of which is located on each side of theside form supporting plunger 92 as best shown in Fig. 11. A largediameter machine screw is threaded through each bracket ||0 until theend thereof is juxtaposed to the said plunger S2 with only workingclearance therebetween. A lock nut ||2 fixes the said machine screws intheir adjusted positions. The machine screws prevent any undue tiltinglongitudinal of the side forms 33 about the pivots 35 thereof whichwould cause binding of the slides 33 thereof between the guides 93secured to the longitudinal main frame members 43.

Subframe The subfrarne 28 which carries the compaction members 29 andtampers 3|) is composed of a forward transversely disposed channelmember H5 and a rear transversely disposed channel member IE5 held inthe desired spaced relationship with respect to each other by aplurality of upper channel struts connected to the top anges thereof andby a plurality of suitably bent lower angle struts ||3 connected to thebottom iianges thereof.

The said subframe 28 is suspended at each end from the main frame 25 bymeans of a pair of adjustable hanger rods ||9 pivotally connected attheir lower ends to the top of the channel members H5 and I3 and attheir upper ends to a pair of arcuate levers |23 keyed to a suitablydisposed subframe hanger shaft |2| at one side of the paver and to asuitably disposed subframe hanger shaft |22 at the other side of thepaver. The subframe hanger shaft |2| is supported on suitable bearings|23, |23 and 25 which are in turn supported on the main frame forwardcross member 4|, the main frame central cross member 82 and one of thesecondary longitudinal main frame members 36 respectively.

An operating crank |26 connected to worm and pinion gearing |27 rotatesa sprocket |28 connected by an endless chain |29 to a sprocket |39 keyedcn the end of the subframe hanger shaft |2|, rotates the said hangershaft |2| and raises and lowers one end of the subframe 28. The subframehanger shaft |22 is supported on suitable bearings |3, |32 and |33 whichare in turn supported on the main frame forward cross member di, themain frame central cross member 62 and the main frame rear cross member43 respectively. An operating crank |34 connected to worm and piniongearing |35 rotates a sprocket |33 connected by an endless chain |37 toa sprocket |33 keyed on the subframe hanger shaft |22 and rotates thesaid hanger shaft |22 and raises and lowers the other end of the subfame23. ITllhus, the subi-frame 33 may be raised, lowered and tilted withrespect to the main frame 25 during the operation of the paving machineas may be desired or required to maintain the longitudinal grade andtransverse slope of a strip of pavement being laid thereby.

In order to prevent movement of the subframe 28 with respect to the mainframe 25 and to transfer the reaction ofv the movement of the compactionmembers 29 and tampers 3D carried by the subframe 28 to the main frame25, a pair of vertically disposed roller guides |39 are welded orotherwise secured to the inside of each of the main frame members f insuch suitable spaced relationship as to permit the guide contact plates|48 and IM on the sub-frame members H5 and ||6 respectively to beadjusted in constant contact rthereagainst as hereinafter de.- scribedin detail. The'said roller guides |39 are preferably composed of achannel frame member |42 having a plurality of closely spaced guiderollers |43 journaled on pins |44 pressed through the flanges thereof.The web of the said channel guide frame member |42 is cut away to permitthe periphery of the rollers |43 to extend therethrough as bestindicated in Figs. 9 and 10.

The guide contact plates |48 located on the subframe transverse channelmember |15 near each end thereof is preferably welded thereto as shownin Fig. 10.' However, the guide contact plate I4| located on thesub-frame transverse channel member IIE near each end thereof isadjustably supported on the ends of adjusting screws |45 ydisposedthrough the said channel member II6 and threaded through a suitableadjusting screw mounting plate |46 welded across the ends of the flangesof the channel member ||6 as best shown in Figs. 9 and 10. By turning upthe adjusting screws I 45 the guide contact plates |49 and I4I arebrought tightly up against the rollers |48 of the roller guides |39whereby to prevent longitudinal movement of the subframe 28 with respectto the main frame 25. The said adjusting screws |45 are xed in theiradjusted position by means of turning the lock nuts |41 threaded thereontightly against the adjusting screw mounting plates |45.

The said subframe 28 has a pair of upwardly disposed brackets |48secured on top of the said forward and rear transversely disposedchannel members I I and I6 by such means as the rivets |49. The brackets|48 have the Compactortamper drive shaft 81 journaled on the top thereofby means of suitable bearings |59.

compacter-tamper mechanism The novel compacter-tamper mechanism employedcomprises a plurality of compactertamper assemblies each composed of acompaction member 29 and a tamper 30. Each compaction member consists ofa suitably curved shoe |55 and a bulldozer plate |56 extending upwardlyfrom the toe of the said shoe |55 both of which are preferably removablysecured to a shoe casting |51 in such a manner as to admit of removalfor repair or replacement. Each compaction member shoe casting |51 isprovided with a pair of upwardly and rearwardly extending arms |58 whichare secured to the eccentric strap |59 of eccentrics |69 keyed to atransversely disposed eccentric drive shaft |6| which is sup-ported on aplurality of bearings |62 bracketed from the rear transverse channelsubframe member H6 on suitable brackets |63 secured thereto by suchmeans as the machine bolts |64 as best shown in Figs. 9 and 13. Eachpair of eccentrics |69 which actuate one of the compacter-tamperassemblies of the paver is preferably mounted on the eccentric driveshaft |6| in 180 degree staggered relationship with respect to theadjacent pair of eccentrics |60 which actua-te the adjacentcompacter-tamper assembly to reduce the vibration of thecompacter-tamper mechanism to a minimum, see Fig. 9.

Each compaction member 29 is pivotally linked and supported from theforward transverse channel sub-frame member I|5 on a pair of dependingpivot bars |65 each pivoted by an upper pivot pin |66 journaled througha pair of brackets |61 secured by machine bolts |68 to the said forwardtransverse sub-frame member I I5 and by a lower pivot pin |69 journaledthrough an L- shaped fitting |18 xed through one or two suitable lugs|1I cast integral with and extending upwardly from the shoe casting |51by the securing nuts |12.r

Each tamper 39 is formed of a suitably curved plate 380 which isgenerally horizontally disposed and positioned directly to the rear ofeach compaction member 29. A spacer bar |590 is positioned between andsupported by each pair of eccentric straps |59 from which the forwardend or toe of each tamper 36 is pivotally supported by means of anadjustable threaded sleeve type depending pivot bar |13 pivoted by anupper pivot pin |14 extending through a lug |15 secured by means of abolt |16 to the said spacer bar |598 and by a lower pivot pin |11extending through a suitable tting |18 secured by means of a nut |19 tothe center of the front end tamper supports |89. The rear end or heel ofeach tamper support |88 is pivotally connected by means of a suitablefitting IBI, securing nut |19 and pivot |82 to the depending end of atamper strut rod |83 secured by upper and lower nuts |84 threadedthereon to a bracket |85 welded or otherwise secured to a sub-channel|86 disposed parallel to and nested within the rear transverselydisposed channel subframe member |I6. The said sub-channel |86 isretained in slidable relationship against slide plates |81 welded on theweb of the said rear transversely disposed channel sub-frame member I I6by batteri angles |88 secured across the edges of the flanges of thesaid channel sub-frame member IE6 by angle clips |89 as best shown inFig. 13.

The said sub-channel |86 is raised and lowered vby quick-lift means ashereinafter described to quickly adjust the elevation at which the heelof the tamper 38 is positioned during the operation of the machine.Also, the height at which the compaction members 29 operate with respectto the eccentric drive shaft I6! may be adjusted by threading the pivotbars supporting the same more or less into the upper pivot pin |66journaled through the brackets |61 on the forward transversely disposedchannel sub-frame member II5. The pivot bars |65 are xed in their adjusted position by means of lock nuts |99 threaded thereon. The height atwhich the forward end of the tampers 38 operates with respect to theeccentric drive shaft |6I may be adjusted by turning the pivot bar I 13into or out of its threaded sleeve I9I. A lock nut |92 threaded on thepivot bar |13 xes the same in its adjusted position when turned againstthe end of its threaded sleeve I9I.

The quick-lift mechanism employed to support, raise and lower the rearends or heels of the tampers 39 is best shown in Figs. 6, '7, 8 and 13.As hereinbefore described, the heels of the tampers 30 are pivotallyconnected to the lower depending end of tamper strut rods |83 which arein turn fixed through brackets welded to a sub-channel |86 retained innested relationship within the said rear transversely disposed channelsubframe member IIS. The said sub-channel |86 is suspended from aquick-lift shaft |93 journaled in suitable cradles formed in the upperchannel struts |I1 of the sub-frame 28 by means of two bifurcatedarcuate levers |94 keyed on the said quick-lift shaft |93y which engagespaced nuts |95 threaded on the upper end of hanger rods |96 welded tothe said sub-channel |86 and extending upwardly therefrom through theflange thereof and telescopingly through the upper flange of said reartransversely disposed channel sub-frame member II6 as best shown in Fig.8.

Lock nuts I'! keep the spaced nuts |95 threaded on the hanger rods |96in their proper adjusted position. The said quick-lift shaft |93 is alsojournaled at each side of each of the said bifurcated arcuate levers |94through suitable angle clips |28 welded to the top of the said rearchannel sub-frame member I as shown in Fig. 8.

The quick-lift shaft |93 is rotated by a suitable quick-lift lever |99keyed thereto and is prevented from being rotated by the lifting actionof the heels of the tampers 36V during the operation of the pavingmachine by a. suitably disposed spring loaded pawl 262 on the saidquick-lift lever |S9 which engages a ratchet 29| secured to one of theupper channel struts of the subframe 28 by means of the bolts 202.

Referring now to Fig. 16, the compacter-tamper mechanism is representeddiagrammatically. A compaction member 29 and tamper 3'are shown in a, b,c and d positions which represent a preferred movement thereof throughone complete cycle of the movement of the eccentric |60 in the directionindicated by the arrows 223 in Figs. 13 and 16 around the eccentricdrive shaft |5| Fig. 17 shows the path takenv by the point X at the heelof the compaction member 29 and Fig. 18 shows the path taken by thepoint Y at the toe of the said compaction member 29 during one completerevolution of the said eccentric drive shaft Ii and the movement of theeccentric |60 therearound. Also, Fig. 19 shows the path takenr by thepoint Z at the toe of the tamper member 3B during one completerevolution of the eccentric drive shaft |6| and the movement of theeccentric 5G therearound.

Figs. 16 to 19 inclusive illustratel digrammatically the combinedgenerally elliptical and rocking movement ofthe compaction members in apath parallel to the travel of the paver when in operation coupled withand followed by a treadle action tamper which have been found to producean extremely dense fully compadted pavement. The bulldozing action ofthe compactors 29 is illustratedv in Fig. 16 which also shows the a, b,c and d positions of the bulldozer plate |52 carried by each compactionmember 29 during one complete revolution of the eccentric drive shaft|6| and the movement of the eccentric |68 therearound.

The term generally elliptical and rocking movement of the compactionmembers is not to be construed as limiting the invention to the exactmovement shown in the diagrammatic illustration disclosed in Figs. 16 to19 inclusive. The movement of the compaction members may also be definedas a forward and back movement and a downward movement at the completionof the forward movement greater at the front of the saidV compactionmembers than at the rear thereof. Or, the movement of the compactionmembers may bestatecl as a compound motion including a forward and backmovement and an oscillatory movement. The adjustment of the compactors29 with respect to their point of suspension and the amount ofeccentricity of the eccentric |26 determines the precise movementthereof.

The bulldozers |56 advance surplus material spread ahead of thecompactor-tamper mechanism and permit only suflicient material to be fedfrom the hopper 3| under the compaction members 29 to assure a finishedthoroughly dense pavement of the depth to which the paver is adapted tooperate. The action of the compaction member 29, tampers 36 and, ofcourse, the bulldozers |55 is preferably quite rapid, it being preferredto drive the eccentric shaft 6| at 150 to 300 R. P. M. The drive for thecompactor-tamper mechanism will be hereinafter described in detail Aspecial tamper member 34 is provided at 1- each side of the hopper 3|disposed adjacent the side forms 33 and locate-d just ahead of thecompaction members 2d. The said special tampers 34 are preferably usedto provide an extremely dense and workable concrete adjacent the sideforms 33 which will not slump unreasonably as the side forms 33 progresswith the travel of the machine. Referring now to Fig. 14, each specialtamper 3i! is rigidly connected to a tamper bar 285 reciprocatinglymounted in telescopic relationship through suitable brackets 266 weldedor otherwise secured to the hopper 3 The tamper bar 265 is preferablyprovided with a left and right hand threaded adjusting section 26'! ontowhich lock nuts 228 are threaded to iix the tamper bar 265 at any lengthto which it may be adjusted. A rapidly rotating special tamper eccentricshaft 209 is journaled on suitable bearings 2 i and is driven bysuitable means as hereinafter described in detail. Each special tamperis pivotally suspended by a pivot pin 2|| from an eccentric arm 22depending from a suitable eccentric 2|3 mounted thereabove on theeccentric shaft 269. The eccentric shaft 269 is preferably rotated at aspeed to reciprocate the special tampers 3d considerably faster than themovement of the compaction members 29.

Drives Referring now particularly to Fig. 15 and generally to the drivemechanism shown elsewhere throughout the drawings, the entire machine ispreferably powered by a single source of power such as the gasoline orDiesel engine 'i2 through a main clutch '|3 operated by a main clutchhand lever 255 disposed within reach of the operators platform 'i5connected to the clutch lever '|36 by a suitable linkage 2|5. A maintransmission 'M controlled by a hand lever '|40 is coupled to the clutch'i3 and has the main drive shaft 2|! coupled thereto by means of asuitable flexible coupling 2| 8.

A caterpillar drive transmission SS controlled by a hand lever 696 isdriven by an endless chain drive 2|9 running over a sprocket 220 keyedon the main drive shaft 2|'! and a sprocket 22| extending from thecaterpillar drive main clutch '15| having a control lever T90 which iscoupled to the said caterpillar drive transmission 69. The slow speedshaft 222 of the caterpillar transmission has a sprocket 223 keyedthereon which is connected by an endless chain 221i to a sprocket E25keyed on an idler shaft 226 onto which clutches 22'! controlled by handlevers 2216 are mounted through which power is applied to each of theleft and right hand caterpillar treads 2'! by means of chain drivesv 228running over sprockets 229 keyed on stub shafts 23) carrying the drivenmembers of the clutches 22'! and over the drive sprockets 52 of thecaterpillar treads 21.

The main drive shaft 2|! has a Compactortamper clutch 23| thereoncontrolled by a hand lever 23H) through which power is applied to anidler shaft 232. The compactor-tamper drive shaft 6'! is driven from theidler shaft 232 by means of a chain drive 233 running over-sprockets 2Mand 235 keyed to the idler shaft 232 and to the compacter-tamper driveshaft 6'! respectively. Inasmuch as one end of the Compactortamper driveshaft is supported on the main frame 25 and the other end of theCompactortamper drive shaft is supported on the subframe 28, and sincethe sub-frame 23 is adapted to be raised and lowered withrespect to themain frame 25, two universal joints 235 and a splined section 61|) areemployed to operatingly connect the two end sections of the saidcompactor-tamper drive shaft 61. The eccentric drive shaft |6| is drivenby a chain drive 231 running over a sprocket 233 keyed on the eccentricdrive shaft |6| and a sprocket 239 keyed on the compactor-tamper driveshaft 51 located between the brackets |48 on the sub-frame 28.

The agitator shaft 82 is driven by means of a chain drive 225 runningover a sprocket 82 keyed on the said agitator shaft 89 and over asprocket 24| keyed on an idler shaft 242 rotated by thecompactor-tainper drive shaft 51 through the meshed reduction gears 243and 244 keyed on the idler shaft 242 Varid the compactor-tamper driveshaft 51 respectively.

The special tampers 34 are driven by means of a chain drive 245 runningover sprockets 245 and 241 keyed on the idler shaft 232 and on thetamper eccentric shaft 299 respectively.

The various drive means disclosed and described herein are not a part ofthis invention, it being understood that the means for applying power toand driving the various movable elements of the novel paver disclosedherein may be altered and arranged in any desired manner withoutdeparting from the scope of the invention.

Alternate Embodiment The novel paver disclosed in Figs. 1 to 19inelusive is changed in but a few minor details to admit of the samebeing used for laying, compacting and tamping asphalt mixes.

The embodiment of the invention preferably employed to lay concretemixes disclosed in Figs. 1 to 19 inclusive and the embodiment of 'theinvention preferably employed to lay asphalt mixes disclosed in Figs. 20to 22 inclusive are substantially identical except that the side forms339 of the embodiment of the invention disclosed in Figs. 20 to 22inclusive are shortened and that heating elements 248 and 249 have beenadded to the compaction members 29 and `tampers 35] respectively whichare connected by electric cables 256 through the conduit 25| to anelectric panel and fuse box 252. By referring particularly to Figs. 21and 22, it will be observed that a suitable electric generator 35 ispreferably added to the embodiment of the invention disclosed thereinwhich is supported on the secondary longitudinal main frame members 63and is driven by means of a V-belt drive 253 running between pulleys25rand 255 keyed on the generator shaft 256 and the main drive shaft 2|1respectively. The said generator 35 is electrically connected to theelectric panel 252.

It will be noted that the special tampers 34 have been omitted in theembodiment of the invention disclosed in Figs. 2|) to 22 inclusiveinasmuch as they need not be employed when the novel paver is being usedfor laying most asphalt mixes.

OPERATION The embodiment of the invention shown in the drawings havebeen described in detail and a description of the operation of thevarious elements has been given in connection with the novel mechanismsemployed, however, following of the vnovel paver as a unitary wholeshowing the operation of the component parts thereof in relationship toeach other.

In the use of a paver carrying its own side forms las herein disclosed,the front wheels 26 and rear caterpillar treads 21 both first rest onthe rough grade 81. The term rough grade 31 used herein refers to thefine or partially graded terrain, subgrade or other base upon which aconcrete or asphalt pavement is to be laid by the novel paver hereindisclosed.

The sub-frame 28 is adjusted with respect to the main frame by means ofthe cranks |26 and |34 to set the Compactors 29 and tampers 39 to thedesired finished grade 818 with the heels of the tamper members liftedwith respect to the Compactors 29 by the quick-lift lever 99. The sideforms 33 or 338 are set against the rough grade 81 by means of thelevers 91. If a concrete pavement is to be laid by the paver, thespecial tamper members 34 are adjusted to the desired position byturning the adjusting sections 201 of the tamper bars 265 If an asphaltwill be given a brief description of the operation mix is to be laid bythe paver, the special tamper members are removed or otherwise madeinoperable and the generator 35 is started to supply current to theheating elements 248 and 249 of the compaction members 29 and tampers 30respectively for pre-heating the same to prevent the asphalt mix fromsticking thereto. The compactor-tamper mechanism lis then startedoperating and the conciete or asphalt mix is dumped by supply trucks orthe like into the hopper 3| as indicated by the dash and two dot lines251 in Figs. 2, 3 and 21 wherein the agitator blades 32 which revolvecontinuously during the operation of the compactor-tamper mechanismdistribute the said mix across the hopper 3| from whence it gravitatesto the rough grade 81 below the open bottom 3H! of the hopper 3| andahead of the compaction members 29 which are equipped with bulldozerplates |56.

The mix thus spread as indicated by the dash and two dot lines 258 inFigs. 2, 3 and 21 is compacted by the compaction members 29 having acombined elliptical and rocking movement as is obvious from thediagrammatic representation of the operation thereof disclosed in Figs.16 to I9 inclusive, The bulldozing action of the compaction members 29causes the bulldozer plates |56 thereof to advance surplus mix notcompacted into the finished pavement strip thereby ahead of the saidcompaction member 29 as the machine is moved forward as indicated by thearrow 250 in Figs, 1, 2, 3 and 2l under power applied to the caterpillartreads 21 as hereinbefore described in detail. The tamper members 39follow the compaction members 29 and tamp the mix compacted by thecompaction members 29 to a final smoothness and to a maximum degree ofdensity. As soon as the front ends of the caterpillar treads 21 creeponto the finished pavement at the finished grade 819, the quickliftmechanism operated by the quick-lift lever |99 is employed to drop theheels of the tampers 39 and the sub-frame 28 carrying the compactionmembers 29 and tampers 30 is lowered by the cranks |26 and |34 toreadjust the compactor-tamper mechanism to lay the desired thickness ofpavement with the front wheels of the paver running on the rough grade81 and the caterpillar treads 21 thereof running on the finished grade319 of the pavement laid by the machine.

The sub-frame 28 may be tilted by the manipulation of the cranks 26 andi3d when it is desired to lay a strip of pavement on a transverse slopeor when it is desired to provide a superelevation at the outer side of acurved strip of pavement being laid.

If and when the front wheels 26 travel over a change of grade, or if themachine is backed off of a strip of pavement just laid thereby, theheight of the compacter-tamper mechanism is adjusted to suit theparticular condition by the manipulation of the cranks ltand i315 whichraise or lower the sub-frame 2S carrying the entire compacter-tampermechanism and by manipulating the quick-lift lever I9@ which raises andlowers the heels of the tampers 36.

Obviously, not only does the machine completely and accurately layconcrete and asphalt mixes into a completely compacted pavement ofmaximum density but it is completely adapted to function under allworking conditions to lay concrete or asphalt mixes without the use ofpre-set forms. However, as hereinbefore mentioned, it is contemplatedthat the novel compactor-tamper mechanism disclosed herein may beemployed in like machines adapted to travel in the usual and customarymanner on pre-set road forms.

Although but one embodiment of the invention and one modificationthereof has been disclosed and described herein, it is obvious that manychanges may be madev in the size, shape, arrangement and details of thevarious elements of the invention without departing from the spiritthereof and it is not intended to limit thev scope of the inventionother than by the terms of the appended claims.

I claim:

l. In a paving machine including mobile means therefor, a series ofcompaction members each composed of a bottom shoe and a front bulldozerplate disposed transversely of said machine, a single line of linkagemeans spaced transversely of said Compactors pivotally suspending saidcompactors from said machine to the level of the top of pavement to belaid thereby, a transversely disposed eccentric shaft on said machine,eccentrics mounted on said eccentric shaft, and rearwardly and upwardlyextending arms connecting said compaction members with said eccentricswhereby upon rotation of said eccentric shaft the compaction members aregiven a combined generally elliptical and rocking motion 2. In a pavingmachine including mobile means therefor, a series of compaction memberseach composed of a bottom shoe and a front bulldozer plate disposedtransversely of said machine, a single line of linkage means spacedtransversely of said Compactors pivoted to the machine and to thecompaction members suspending the said compaction members to the levelof the top of pavement to be laid by said machine, a transverselydisposed eccentric shaft on said machine, eccentrics on said eccentricshaft, and rearwardly and upwardly extending arms connecting saidcompaction members to said eccentrics whereby upon rotation of saideccentric shaft a combined generally' elliptical and rocking movement ina path parallel to the travel of the machine is imparted to the saidcompaction members wherein the forward portion of each compaction memberhas a greater downward movement than the rear portion thereof.

3. In a paving machine including mobile means therefor, a series ofcompaction members each CII abastecel composed of a bottom shoe and afront bulldozer plate disposed transversely of said machine, a singleline of linkage means spaced transversely of said Compactors pivoted tothe machine and to the compaction members suspending the said compactionmembers to the level of the top of pavement to be laid by said machine,a transversely disposed eccentric shaft on said machine, eccentrics onsaid eccentric shaft, and rearwardly and upwardly extendingarmsconnecting said compaction members to said eccentrics whereby uponrotation of said eccentric shaft a combined generally elliptical androcking movement in a path parallel to the travel of the machine isimparted to the said compaction members wherein the forward portion ofeach compaction member moves in a generally elliptical path having agreater vertical axis than the vertical axis of the generally ellipticalpath in which the rearward portion thereof moves.

e. In a paving machine, a main frame including mobile means therefor, asub-frame, means for suspending said sub-frame from said main frameincluding means for raising, lowering and tilting the same with respectto the said main frame, a series of compaction members disposedtransversely of said sub-frame, each compaction member being composed ofa bottom shoe and a front bulldozer plate, a single line of linkage rodsspaced transversely of said compactors suspending said compactionmembers from said sub-frame pivoted to the sub-frame at their upper endand to the compaction members at their lower end, an eccentric shaftmounted transversely of said machine on said subframe, eccentricsmounted on said eccentric shaft, and rearwardly and upwardly extendingarms connecting said compaction members with said eccentrics wherebyupon rotation of said eccentric shaft the compaction members are given acombined generally elliptical and rocking motion.

5. In a paving machine including mobile means therefor, a series ofcompaction members each composed of a bottom shoe and a front bulldozerplate disposed end to end transversely of the machine forming anaggregate member for compacting paving material supplied thereto into astrip of pavement and advancing surplus paving material thereahead, asingle line of linkage means spaced transversely of said Compactorspivotally suspending said compaction members from said machine to thelevel of the top of pavement to be laid by said machine, means forraising, lowering and laterally tilting said aggregate member withrespect to pavement being laid and the terrain over which the pavementis being laid, a transversely disposed eccentric shaft on said machine,eccentrics mounted on said eccentric shaft, and rearwardly and upwardlyextending arms connecting said compaction members with said eccentricswhereby upon rotation of said eccentric shaft the compaction membershave imparted thereto a compound generally elliptical and rocking motionin a path parallel to the travel of the machine wherein the forwardportion of each compaction member has a greater downward movement thanthe rear portion thereof.

6. In a paving machine including mobile means therefor, side formscarried thereby, a series of compaction members each composed of abottom shoe and a front bulldozer' plate disposed end to endtransversely between the said side forms forming an aggregate member forcompacting paving material supplied thereto into a strip of pavement andadvancing surplus paving material thereahead, a single line of linkagemeans spaced transversely of said compactors pivotally suspending saidcompaction members from said machine to the level of the top ofpavement, to be laid by said machine, a transversely disposed eccentricYshaft on said machine, eccentrics mounted on said eccentric shaft,rearwardly and upwardly extending arms connecting said compactionmembers with said eccentrics whereby upon rotation of said eccentricshaft the compaction members have imparted thereto a compound generallyelliptical and rocking motion in a path parallel to the travel of themachine wherein the forward portion of each compaction member has agreater downward movement than the rear portion thereof, and resilientmeans between the machine and the said side forms for urging the saidside forms against the terrain adjacent the strip ofpavement being laid.

7. In a paving machine including mobile means therefor, a series ofcompaction lmembers each composed of a bottom shoe and a front bulldozerplate disposed end to end transversely of the machine forming anaggregate member for compacting paving material supplied theretointo astrip of pavement and advancing surplus paving material thereaheadaseries of tampers disposed end to end transversely of the machineforming an aggregate member for tamping the strips of paving compactedby the said compaction members, a single line of linkage means spacedtransversely of said Compactors including pivot means at both endsthereof pivotally suspending said compaction members from said frame tothe level of the top of the pavement to be laid by said machine, meansfor raising, lowering and laterally tilting said aggregate memberssimultaneously with respect to pavement being laid and the terrain overwhich the pavement is being laid, `a transversely disposed eccentricshaft on said machine, eccentrics mounted on said eccentric shaft,rearwardly and upwardly extending arms` connecting said compactionmembers with said eccentrics whereby upon rotation ofY said eccentricshaft the compaction members have imparted thereto a compound generallyelliptical and rocking motion in Va path parallel to the travel of themachine wherein the forward portion of each compaction member has agreater downward movement than the rear portion thereof, linkage meansincluding transverse pivot means suspending the rear of said tampersfrom said machine to the level of the top of pavement to be laid by themachine, and linkage means connecting the forward end of said tampers tosaid compaction member actuating arms whereby to impart to said tampersa treddle action.

8. In a paving machine including mobile means therefor, side formscarried thereby, a series of compaction members each composed of abottom shoe and a front bulldozer plate disposed end to end transverselybetween the said side forms forming an aggregate member for compactingpaving material supplied thereto into a strip of pavement and advancingsurplus paving material thereahead, a series of tampers disposed end toend transversely between said side forms forming an aggregate member fortamping the strips of paving compacted by the said compaction members, asingle line ofA linkage means spaced transversely of said Compactorsincluding pivot means at both ends thereof pivotally suspending saidcompaction members from said machine to the level of the top of thepavement to be laid by said machine, a transversely disposed eccentricshaft on said machine, eccentrics mounted on said eccentric shaft,rearwardly and upwardly extending arms connecting said compactionmembers with said eccentrics whereby upon rotation of said eccentricshaft the compaction members have imparted thereto a compound generallyelliptical and rocking motion in a path parallel to the travel of themachine wherein the forward portion of each compaction member has agreater downward movement than' the rear portion thereof, linkage meansincluding transverse pivot means suspending the rear of said tampersfrom said machine to the level of the top of pavement to -be laid by themachine, linkage means connecting the forward end of said tampers tosaid compaction member actuating arms whereby to impart to said tampersa treddle action, and `resilient, means between the machine and thelsaid side forms for urging the said side forms' against the terrainadjacent the strip of pavement being laid.

9. In a paving machine including mobile means therefor, sideformscarried thereby, a series of compaction members each composed of abottom shoe and a front bulldozer plate disposed transversely of saidmachine, a single line of linkage means spaced transversely of saidcompactors pivotally suspending said Compactors-from said machine to thelevel of the top of pavement to be laid thereby, a transversely disposedeccentric shaft on said machine, eccentrics mounted on said eccentricshaft, rearwardly and upwardly extending arms connecting said compactionmembers with said eccentrics whereby upon rotation of said eccentricshaft the compaction members are given a combined generally ellipticaland rocking motion, and resilient means between the main frame and theside forms for urging said side fonms against the terrain adjacent thestrip of pavement being laid.

' 10. In aV paving machine, a main frame including mobile meanstherefor, side forms carried l* thereby, a sub-frame, means forsuspending said sub-frame from said main frame including means forraising, lower and tilting the same with respect to the said main frame,a series of compaction members disposed transversely of said sub-frame,each compaction member being composed of a bottom vshoe and a frontbulldozer plate, a single line of linkage rods spaced transversely ofsaid Compactors suspending said compaction members from said sub-framepivoted to the sub-frame at their upper end and to the compactionmembers at their lower end, an eccentric shaft mounted transversely onsaid subframe, eccentrics mounted on said eccentric shaft, rearwardlyand upwardly extending arms connecting said compaction members with saideccentrics whereby upon rotation of said eccentric shaft the compactionmembers are given a combined generally elliptical and rocking motion,and means for urging said side forms against the terrain adjacent thestrip of pavement being laid.

1l. In a paving machine, a main frame including mobile means therefor, asubframe, means for suspending said sub-frame from said main frameincluding means for raising, lowering and tilting the same with respectto the said main frame, a series of compaction members disposedtransversely of said -sub-frame, each compaction member being composedof a bottom shoe and a front bulldozer plate, a single line of linkagerods spaced transversely of said compactors suspending said compactionmembers from said sub-frame pivoted to the sub-frame at their upper endand to the compaction members at their lower end, an eccentric shaftmounted transversely on said subframe, eccentrics mounted on saideccentric shaft, rearwardly and upwardly extending arms connecting saidcompaction members with said eccentrics whereby upon rotation of saideccentric shaft the compactio-n members are given a combined generallyelliptical and rocking motion, a tamper disposed rearwardly of eachcompaction member, linkage means including transverse pivot meanssuspendeding the rear of said tampers from said sub-frame to the levelof the top of pavement to be laid by the machine, and linkage meansconnecting the forward end of said tampers to said compaction memberactuating arms whereby to impart to the said tampers a treddle action.

12. In a paving machine, a main frame including mobile means therefor,side forms carried thereby, a sub-frame, means for suspending saidsub-frame from said main frame including means for raising, lowering andtilting the same with respect to the said main frame, a series ofcompaction members disposed transversely of said sub-frame, eachcompaction member being composed of a bottom shoe and a front bulldozerplate, a simple line of linkage rods spaced transversely of saidCompactors suspending said compaction members from said sub-framepivoted to the sub-frame at their upper end and to the compactionmembers at their lower end, an eccentric shaft mounted transversely onsaid sub-frame, eccentrics mounted on said eccentric shaft, rearwardlyand upwardly extending arms connecting said compaction members with saideccentrics whereby upon rotation of said eccentric shaft the compactionmembers are given a combined generally elliptical and rocking motion, atamper disposed rearwardly of each compaction member, linkage meansincluding transverse pivot trans.- verse pivot means suspending the rearof said tampers from said sub-frame to the level of the top o-f pavementto be laid by the machine, linkage means connecting the forward end ofsaid tampers to said compaction member actuating arms whereby to impartto said tampers a treddle action, and resilient means between said mainframe and said side forms for urging said side forms against the terrainadjacent the strip of pavement being laid.

13. In a paving machine including mobile means therefor, a series ofcompaction members each composed of a shoe curved on its bottomlongitudinally with respect to the machine and disposed transversely ofsaid machine, a single line of linkage means spaced transversely of saidCompactors pivotally suspending said compactors from said machine to thelevel of the top of pavement to be laid thereby, a transversely disposedeccentric shaft on said machine, eccentrics mounted on said eccentricshaft, and rearwardly and upwardly extending arms connecting saidcompaction members with said eccentrics whereby upon rotation of saideccentric shaft the compaction members are given a combined generallyelliptical and rocking motion.

14. In a paving machine, a main frame including mobile means therefor, asub-frame, means for suspending said sub-frame from said main frameincluding means for raising, lowering and tilting the same with respecttothe said main frame, a series of compaction members disposedtransversely of said sub-frame, each compaction member being composed ofa shoe curved on its bottom longitudinally with respect to the machine,a single line o-f linkage rods spaced transversely of said Compactorssuspending said compaction members from said sub-frame pivoted to thesub-frame at their upper end and to the compaction members at theirlower end, an eccentric shaft mounted transversely on said sub-frame,eccentrics mounted on said eccentric shaft, rearwardly and upwardlyextending arms connecting said compaction members with said eccentricswhereby upon rotation of said eccentric shaft the compaction members aregiven a combined generally elliptical and rocking motion, a tamperdisposed rearwardly of each compaction member, linkage means includingtransverse pivot means suspending the rear of saidY tampers from saidsub-frame at the level of the top of pavement to be laid by the machine,and linkage means connecting the forward end of said tampers to saidcompaction member actuating arms whereby to impart to the said tampers atreddle action.

ROBERT D. BAKER.

